linux-kernel - [PATCH 05/13] x86/amd_gart: look at coherent_dma_mask instead of GFP

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Message-Id: <20180305174655.9878-6-hch@lst.de>
Date:   Mon,  5 Mar 2018 09:46:47 -0800
From:   Christoph Hellwig <hch@....de>
To:     x86@...nel.org
Cc:     Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>,
        Tom Lendacky <thomas.lendacky@....com>,
        David Woodhouse <dwmw2@...radead.org>,
        Muli Ben-Yehuda <mulix@...ix.org>,
        Jon Mason <jdmason@...zu.us>, Joerg Roedel <joro@...tes.org>,
        iommu@...ts.linux-foundation.org, linux-kernel@...r.kernel.org
Subject: [PATCH 05/13] x86/amd_gart: look at coherent_dma_mask instead of GFP_DMA

We want to phase out looking at the magic GFP_DMA flag in the dma mapping
routines, so switch the gart driver to use the coherent_dma_mask instead,
which is used to select the GFP_DMA flag in the caller.

Signed-off-by: Christoph Hellwig <hch@....de>
---
 arch/x86/kernel/amd_gart_64.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/x86/kernel/amd_gart_64.c b/arch/x86/kernel/amd_gart_64.c
index 52e3abcf3e70..79ac6caaaabb 100644
--- a/arch/x86/kernel/amd_gart_64.c
+++ b/arch/x86/kernel/amd_gart_64.c
@@ -484,7 +484,7 @@ gart_alloc_coherent(struct device *dev, size_t size, dma_addr_t *dma_addr,
 	unsigned long align_mask;
 	struct page *page;
 
-	if (force_iommu && !(flag & GFP_DMA)) {
+	if (force_iommu && dev->coherent_dma_mask > DMA_BIT_MASK(24)) {
 		flag &= ~(__GFP_DMA | __GFP_HIGHMEM | __GFP_DMA32);
 		page = alloc_pages(flag | __GFP_ZERO, get_order(size));
 		if (!page)
-- 
2.14.2